Speed Unit Converter
Effortlessly switch between any speed units. Our tool provides instant and accurate conversions for your needs.
Fast, Free, Private Speed Unit Converter (Offline)
Convert speed units instantly mph, km/h, m/s, ft/s, and knots. 100% client side, lifetime free, unlimited use. No uploads, no sign ups, truly private.
Top, fast, best-in-class, and unlimited. Your information is 100% confidential and secure.
Why people love this speed converter
Offline & secure
Runs entirely in your browser. Your values never leave your device.
Unlimited & free forever
No accounts, no limits convert as much as you want.
Fast & simple
Pick units, type a value, get results instantly with clear precision.
Works everywhere
Modern browsers on Windows, Mac, Linux, and mobile devices.
No data collected
100% client-side processing keeps your data private.
Accurate results
Reliable conversion factors with smart rounding for readability.
Popular uses worldwide
Driving & navigation
Convert between mph and km/h for trips and speed limit signs.
Aviation & drones
Switch between knots, m/s, and km/h for flight planning and telemetry.
Marine & sailing
Knots to mph/km/h for boating, racing, and weather reports.
Running & cycling
m/s and km/h conversions for training data and sensors.
Engineering & physics
Convert ft/s and m/s in simulations and calculations.
Weather & wind
Convert wind speeds between m/s, km/h, mph, and knots.
How to convert speed units
- Select your “From” unit (e.g., mph).
- Enter a value (e.g., 65).
- Select your “To” unit (e.g., km/h).
- See instant results and the 1 unit summary below.
- Use “Reset” to start again.
Tip: You can type into either side both fields update intelligently.
Supported units
Formulas and quick reference
- mph to m/s: m/s = mph × 0.44704
- km/h to m/s: m/s = km/h ÷ 3.6
- ft/s to m/s: m/s = ft/s × 0.3048
- knots to m/s: m/s = kn × 0.514444
1 m/s equals:
- 3.6 km/h
- 2.23694 mph
- 3.28084 ft/s
- 1.94384 kn
Best practices
- Check local units (mph vs km/h) when sharing speed values across regions.
- Round only at the end if you’ll do further calculations.
- Keep original values for auditing and records.
Frequently Asked Questions
Is it private and secure?
Yes. Everything runs locally in your browser no uploads, no tracking, no servers.
Is it really free and unlimited?
Yes. Lifetime free, unlimited conversions, and no sign ups.
Which units are supported?
mph, km/h, m/s, ft/s, and knots.
Does it work offline?
Yes. Your browser caches assets after the first visit and can run offline.
How accurate are results?
We use precise constants (e.g., 1 mile = 1609.344 m; 1 kn = 1852 m/h) and smart rounding.
Can I use it on mobile?
Absolutely. It works on modern mobile and desktop browsers.
Global availability (GEO)
Built for users worldwide: USA, UK, Canada, Australia, India, EU (Germany, France, Spain, Italy, Netherlands), Middle East (UAE, Saudi Arabia), Asia (Singapore, Malaysia, Philippines, Indonesia, Japan, South Korea), Africa (Nigeria, South Africa, Egypt), and Latin America (Brazil, Mexico, Argentina).
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